Make better use of struct aligns

Author: maciejhirsz

src/number.rs

@@ -16,17 +16,17 @@ const NAN_MASK: u8 = !1;
 #[derive(Copy, Clone, Debug)]
 pub struct Number {
     category: u8,
-    mantissa: u64,
     exponent: i16,
+    mantissa: u64,
 }
 
 impl Number {
     #[inline]
     pub fn from_parts(positive: bool, mantissa: u64, exponent: i16) -> Self {
         Number {
             category: positive as u8,
-            mantissa: mantissa,
             exponent: exponent,
+            mantissa: mantissa,
         }
     }
 
@@ -249,8 +249,8 @@ macro_rules! impl_unsigned {
             fn from(num: $t) -> Number {
                 Number {
                     category: POSITIVE,
-                    mantissa: num as u64,
                     exponent: 0,
+                    mantissa: num as u64,
                 }
             }
         }
@@ -267,14 +267,14 @@ macro_rules! impl_signed {
                 if num < 0 {
                     Number {
                         category: NEGATIVE,
-                        mantissa: -num as u64,
                         exponent: 0,
+                        mantissa: -num as u64,
                     }
                 } else {
                     Number {
                         category: POSITIVE,
-                        mantissa: num as u64,
                         exponent: 0,
+                        mantissa: num as u64,
                     }
                 }
             }
@@ -332,8 +332,8 @@ impl ops::Neg for Number {
     fn neg(self) -> Number {
         Number {
             category: self.category ^ POSITIVE,
-            mantissa: self.mantissa,
             exponent: self.exponent,
+            mantissa: self.mantissa,
         }
     }
 }
@@ -354,8 +354,8 @@ impl ops::Mul for Number {
                 // Xor all the things!                              ^ _ ^
 
                 category: self.category ^ other.category ^ POSITIVE,
-                mantissa: self.mantissa * other.mantissa,
                 exponent: self.exponent + other.exponent,
+                mantissa: self.mantissa * other.mantissa,
             }
         }
     }

src/object.rs

@@ -2,7 +2,7 @@ use std::{ ptr, mem, str, slice, fmt };
 
 use value::JsonValue;
 
-const KEY_BUF_LEN: usize = 30;
+const KEY_BUF_LEN: usize = 32;
 
 struct Node {
     // Internal buffer to store keys that fit within `KEY_BUF_LEN`,

src/short.rs

@@ -5,8 +5,8 @@ pub const MAX_LEN: usize = 30;
 
 #[derive(Clone, Copy)]
 pub struct Short {
-    value: [u8; MAX_LEN],
     len: u8,
+    value: [u8; MAX_LEN],
 }
 
 /// A `Short` is a small string, up to `MAX_LEN` bytes, that can be managed without